Improvement in machines foe miteing



-FRANK 'AfH-O-WARD, OFv BELFAST, MAINE..

Letters .Patent No. 81,373, dated August 25, 1868.

IMPROVEMENT IN MACHINES FOR MENING.

dit ,Stimuli referti; tuin time trtters tteut mit uiting putt nt tige same.

TO ALL WHOM-IT MAY CONCERN: Y

`:Be it4 known that I, FRANK A.- HOWARD, of Belfast, in the county of Waldo, and State of Maine, have v invented Va new and useful Improvement in -Machines for Cutting Mitre-Joints; and I do hereby declare that 4the followingis a full, clear, and exact description thereof, which will enable others skilled in the art to make which- V and use the same, reference being-had to the accompanying drawing, forming part of this specification, in

.Figure 1 isfa vertical longitudinal section of ,my machine, through the line :c :1 of g. 2. Figure 2 is a top view-of the machine.

Figure 3 is a cross-section of the same, through the line yy of fig. v1. AFigure 4 is a cross-section of the same, through the line z z of iig. 1.

Similar lettera4 of'refe'rence indicate like parts. j The object of this invention is to accomplish the cutting and fitting of mitre-joints for mouldings, pictureframes, and the like, in a perfect and expeditious manner.

This invention has, further, for its object to'iinprove the construction of the machine for which Letters `Patent of the United States were granted tome, bearing date August 21, 1866.

It consists in the manner'of hnging and adjusting the blades which compose the sliding V-shaped cutter;-

and also i'r the provision of an adjustable V-shaped rest-plate, together with other devices perfecting the whole, as will hereinafter he more fully set forth. l j

In the accompanying drawings, the bed-frame of the machine is shown at A, being supported by a leg, B, at the rear end ofthe machine,'rand similar legs at the ends of the cross-hed C C, which latter forms partei the general frame of the machine.I v I The movable bed D slides to and fro in thc bed-frame A, the lsides of which latter are raised and grooved, as show-n, to furnish guides for the sliding bed. Y

The sliding bed bears the cutters E E, and is actuated to and fro by means ofthe lever R, which is formed with a toothed sector, S, which latter engages with a rack, T, aihxed to the sliding bed, as shown'.

The sector oscillates on a shaft, u, having bearings in uprights t t, aiiixed to the bed-frame A, as shown. By means of this lever, the bed D and its cutting-devices are actuated against the moulding or stripto be lnitred. f

This moulding is shown in red, and is moved'acrosspthe path ofthecutters upon the cross-bed C C, whereby the desired'point to b e cut is brought opposite the w-shaped notch in the rest-plate I, and which notch is opposite to the cutters.'`

The angle which the cutter-plates E E make with each other, is made variable, by a means to be described,

`and -the V-shaped notch b b corresponds to the maximum angle which is permitted tothe said'cutter-plates, so.

'that when the lat-ter are adjusted to the greatest angle with cach otherfthey will,`when actuated forward, pass l with easy contactV into the V-,shapcd notch b, and, in so passing, encounter the moulding-strip, and cut it in twain, leaving thesevered ends with a bevel suitable for'being fitted together to form a mitre-joint.

I The angle of the notch is not adjustableV to correspond exactly with the angle of the cutter when the latter angle is made more acute, but the small variation ofsthe angle generally. employed in practice does not require that the notch in the'1estplate conform exactly to the angle of the cutter in order to operate el'iectually.

The cutter-plates E E are afiixed to the plates G G, which latter are 'united by a hinge, H.

The pintle-rod, w, of the hinge passes through the holder-plate U, and is affixed thereto with a nut.

The upper edges of the hinged plates are also` provided with rods 1t 1t, the reduced ends of which work in the arched slots .m m, and thus permit the plates G G, and consequently thecutterplates`E E affixed thereto, to be adjusted to any angle within the limit'of the said slots.

The rods 1t n are provided with nuts, which are screwed up against the back of the plate U, and serve, in connection with the nut on the pintle rod u', to hold the cutter-plates firmly against the plate U.

This` latter plate slides up and down on the vertical rods Z Z, which rise from thesliding bed, and are connected at thetop by across'plate, g,'which is aixed to the said rods by nuts yg.

The plate U slides np and down en these rods by means of lugs o o, cast on or affixed to the said plete, and which work on the rods ll as guides.

The plate U is raised or lowered by means ol the screwrod Q, which has its upper bearing in the plate g, and is held in place by a nut or cap, h.

The lower bearing is supported `by the sliding bed D, through which the rod passes. y

The plate U is connected with thescrew-rod by thenut i, which is aiixed tothe said plate, and is provided with a hollow thread fitting the thread of the screw-rod, whereby, when the rod is rotated in its bearings, the plate U and its cutter are raised or lowered. A

The rest-plate I has a vertical movement in the slotted plates J J, which are aixed to cross-bed C and its guide-rail V V.

The lateral edges of the rest-plate are provided with tongues, r r, which t with easy contact in the grooves or slots, q, of the plates J J. I

The rest-plate is moved up or down by means of a screw-rod,f, which has its lower bearing in the plate K, connecting the two vertical plates J J. The upper bearing of thisscrew-rod is in the bed-frame A.

The rest-plate is moved, when the screw-rod frotates, by meansof a nut, @working in the said rod, and aixed to the rest-plate. l

In practice, the mitre-joint is not eut by a single movement'ot` the cutter, but by a few successive movements, and thercutter and rest-plate must be moved down together a short distance after each eut is made.

To accomplish'zthi's unil'orimevement of bothparts, the screw-rods are provided with bevel-pinions W and AN, which are of equal diameter, and which engage with the bevel-wheels L and O on the shaft M, which latter is turned by the hand-wheel P, so that as the latter wheel is turned, the cutter and rest-plate are lowered together.

The wheel() slides on the shaft 'M, as the sliding bed issmovcd to and fro, and the said wheel is held in contact with its pinion by means of a spring, k, which latter is adixed to the sliding bed, and has its lower end formed with a fork, which fits loosely upon a channelled sleeve, c, forming part of the wheel O.

The eye of this wheel is slotted to fit on the raised tongue p, formed on the shaft M,`and is thereby held from turning en the shaft. y

Guide-plates 'v v serveto hold the moulding (shown in red) in plane. These are adjustable by slots and set-screws, as shown. 4 l

' The rabbet-bead a a of the moulding is supported, and thereby prevented from splintering, by the plates a a, which are movable along the notch by means of set-screws and nuts s s, the screws passing through the slots c c, as shown at tig. 3. These plates a' a slide in the slots as the rest-plate described.

The shaft M has its bearings in the upright, d, and part B.

Any suitable gearing may be employed to accomplish the feeding down of the cutter and Vrest-plate automatically. l I

jj arebraces for therods ll.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- I. 'lhe movable V-shaped cutters E, nilixed to plates G, in combination with the notched rest-plate I, operated in the manner described, for the purpose specified.

2. The cutters E E, aiiixed to plates G G, which are hinged together at H, and provided with rods,1z, passing through arched slots m, in tne vertically adjustable holder U, whereby the said cutters are adjusted to the desired angle and there retained, substantially as described, for the purpose specified.

3. Adjusting the plate I and the cutters E E simultaneously, by means of the screw-shaft Q f, nuts c z', shaft M, bevelled gearing N 0 L W, substantially as herein described, for the purpose speeied.

4. A V-shaped cutter, E E, when arranged to approach the wood to be mitred witha horizontal movement, and also provided with a vertical movement, substantially as shown and described, and for the purpose set forth.

FRANK A.' HOWARD.

Witnesses l W. A. ATKINSON, T. THORNDIKE. 

